When dining out, consider photographing the restaurant and your meal. If the meal was memorable, request a copy of the menu and make a note while it’s still fresh in your mind what you ate — to go with your corresponding picture. Upon your return home, your menus may help you seek out restaurants in your area that serve the same dishes… or even allow you to give them ideas for new ones.
Bonus: if you have friends visiting the same destination, you can share your menus with them and help them to have a wonderful meal. Consider giving them a travel debit card before they leave town, so they can enjoy dinner out on you.